JPH0315648Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an antifreeze faucet, and particularly relates to an improvement of Japanese Utility Model Publication No. 40136/1983 by the same applicant.

The cited example above is caused by a defect in the conventional anti-freeze faucet where the ring-shaped gasket adheres to and separates from the cylinder to shut off water, that is, the ring-shaped gasket easily protrudes from the groove due to the force of flowing water. In order to eliminate the defect of being easily cut, the valve body, which has two flat packings and two sleeves, is moved up and down between the two valve seats of the valve body and the cylinder, which are positioned to sandwich the valve body. Then, before one sleeve separates from the cylinder, the other sleeve comes into close contact with the other cylinder, and eventually the flat packing closes the valve seat to allow water to flow and drain. This completely prevents the above-mentioned ring-shaped packing accident.

However, with the above-mentioned valve, the valve body cannot be pulled out from above the pipe, so when repairing the valve body, it is necessary to dig up the soil each time.
Therefore, it is unsuitable for deep burial in extremely cold regions, and a backflow prevention valve is usually installed at the drain outlet to prevent underground sewage from entering the valve box.
Even in the event that the backflow prevention valve malfunctions, it is necessary to dig out of the ground, and since the valve body also rotates when the handle is rotated, the seal can easily loosen, causing water leakage. There were flaws such as things that could happen.

The purpose of this invention is to eliminate the above-mentioned defects and provide an anti-freeze faucet that is ideal for extremely cold regions and eliminates water leakage accidents caused by failure of the seal. Explain the idea.

In Fig. 1, 1 is the valve box of the antifreeze faucet of the present invention, which has an inlet 2 and an outlet 3 on the sides, a cylinder 4 vertically in the middle thereof, and a cylinder 4 at the upper end of the cylinder 4. An upward facing valve seat 5 is formed. A valve cover 6 is connected to the upper end of the valve box 1, and a valve seat body 9 having a cylinder 7 inside and forming a downward valve seat 8 at the lower end is connected to the lower end of the valve cover 6. The valve cover 6 has a female thread 10 for operation inside, and a first drain hole 11 above it.
Drill horizontally. Inside the valve cover 6, a spindle 13 having a male operating thread 12 that is screwed into the female operating thread 10 is housed, and the spindle 13 has a communication hole 14 formed therein that communicates with the first drain port 11. A ball-shaped check valve 15 is seated and accommodated in the communication hole 14 facing downward. The spindle 13 has a U-shaped groove 16 cut out on its side as shown in FIG. 2 at its lower end, and a valve body 18 on its upper end which has a flange 17 that fits into the U-shaped groove. The spindle 13 and the valve body 18 are rotatably connected by inserting the valve body 18 from the opposite direction. The valve body 18 has a flat packing 1 at the lower end.
9. Attach the sleeve 20 below it with screws 21 so that it will not come off, and also attach the flat packing 19' and the sleeve 20' above it. In other words, the flat packing 19 and the sleeve 20 are arranged so that they can be closely removed from the valve seat 5 and the cylinder 4, and the flat packing 19' and the sleeve 20' are arranged so that they can be closely removed and removed from the valve seat 8 and the cylinder 7. sleeve 2
0 and 20' are made of relatively soft plastic or hard rubber so that they do not deform due to the flow of water and allow the cylinders 4 and 7 to slide relatively smoothly. Reference numeral 22 denotes a mantle pipe connected to the upper end of the valve box 1, and a second drain port 23 is bored on the side. 24 is an inner cannula connected to the upper end of the valve lid 6, and the operating section main body 25 is connected to the upper end. A rod 26 is connected to the upper end of the spindle, and an operating rod 27 is connected to the upper end so as to protrude upward from the operating section main body 25. In addition, 28 is a handle,
29 is an O-ring for preventing water leakage.

Next, the operating mode will be explained.

FIG. 1 shows a state in which water is flowing, and water from the inlet 2 flows through the cylinder 4 and the outlet 3 to the downstream piping (not shown), and reaches the faucet at the end. In this state, the flat packing 19' is in close contact with the valve seat 8, preventing water from leaking upward.

When you want to operate the antifreeze faucet to drain water from this state, turn the handle 28 in either direction and the spindle 13 will be screwed onto the valve cover 6.
falls while rotating, and at the same time, the valve body 18, which is rotatably connected to the spindle 13, begins to fall without rotating due to the frictional force between the cylinder 7 and the sleeve 20'. At this time, the flat packing 19' separates from the valve seat, but water does not leak upward due to the sleeve 20', and before the sleeve 20' separates from the cylinder 7, the lower sleeve 20 comes into close contact with the cylinder 4. Cut off water from inlet 2. Thereafter, the sleeve 20' separates from the cylinder 7, and finally the flat packing 19 comes into close contact with the valve seat 5, and the valve body 18 stops descending. Therefore, water in the downstream piping passes through the gap between the cylinder 7 and the valve body 18 from the outlet 3, flows through the opening of the U-shaped groove 16 of the spindle 13, and flows into the communication hole 14, causing the check valve 15 to flow into the communication hole 14. It is lifted and discharged into the ground through the first drain port 11 drilled in the valve lid 6 and the second drain port 23 drilled in the mantle pipe 22. When the drainage is finished, the check valve 15 falls under its own weight and blocks the communication hole, so that together with the O-ring 29, underground sewage does not enter the outlet 3 side. To make water flow again, simply rotate the handle 28 in the opposite direction, and this time, before the sleeve 20 separates from the cylinder 4, the sleeve 2
0' is in close contact with the cylinder 7, so water from the inlet 2 does not flow out to the drain port side.

In addition, as the sleeve 20 enters the cylinder 4, a pressure increase occurs due to the compression of water on the inlet port 2 side, so in order to avoid this, a shallow spiral groove is formed on the sleeve surface, etc. It is also possible to let water escape to the outlet 3 side.

In any case, since the spindle 13 and the valve body 18 are rotatably connected, when the valve body 18 moves up and down, no unreasonable rotational force is applied to the flat packings 20, 20'. 20, 20' will not come loose or the flat packing 20, 20' will not be torn off, and this combined with the fact that the conventional ring-shaped packing is not used prevents water leakage accidents. This is unlikely to occur, and by providing a U-shaped groove 16 cut in the side surface of the spindle 13, the connection between the spindle 13 and the valve body 18 can be made very easily. Simply rotate the main body 25 and remove the valve cover 6 from the valve box 1.
The check valve 15 or the seal 1 of the valve body 18 can be easily installed on the ground without digging underground.
9, 19' and the sleeves 20, 20' can be repaired and inspected, so it can be easily applied even in extremely cold regions where they are buried deep.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of an embodiment of the present invention in a water-flowing state, and FIG. 2 is a partial perspective view of the spindle of the present invention. 1 is a valve box, 2 is an inlet, 3 is an outlet, 4 is a cylinder, 5 is a valve seat, 6 is a valve cover, 7 is a cylinder, 8 is a valve seat, 9 is a valve seat body, 10 is a female screw for operation , 11 is a first drainage hole, 12 is a male screw for operation, 13 is a spindle, 14 is a communication hole, 15 is a check valve, 16 is a U-shaped groove, 17 is a flange, 18 is a valve body, 19, 19 ' is a flat packing, 20, 20' are sleeves, 22 is an outer tube, 23 is a second drainage hole, 24 is an inner tube, 25 is an operating section main body, 26 is a rod, and 27 is an operating rod.

Claims (1)

[Scope of utility model registration request] A valve box that forms a part of the flow path from the inlet to the outflow port in the shape of a vertical cylinder and has an upwardly facing valve seat at its upper end; A downward facing valve seat is provided opposite to the seat, the upper part of which is connected to a valve seat body formed into a cylindrical shape, and a female screw for operation is connected above the valve seat body.
Further, the valve cover has a first drain hole above the valve cover, an operating male thread that is screwed into the operating female thread of the valve cover, and a communication hole that communicates with the first drain port inside. a spindle that houses a check valve and has a U-shaped groove cut in the side at the lower end;
The upper end has a flange that fits into the U-shaped groove, and below the flange there is a sleeve and flat packing that tightly fit the cylinder and valve seat of the valve box, and above that, the valve seat and cylinder of the valve seat body. A second valve body is connected to the upper end of the valve box so as to surround the valve cover, and has a flat packing and a sleeve that come into close contact with and separate from the valve body, and is rotatably connected to the spindle.
a large-diameter outer tube with a drain hole bored therein, a small-diameter inner tube connected to the valve lid, a rod connected to the spindle, an operating section main body connected to the upper end of the inner tube; An antifreeze faucet comprising an operation rod that projects upward from the operation section main body and is connected to the upper end of the rod.